One obvious impact is on the target of restoration. If the climate has changed - as it has now everywhere - then the original forest is not an appropriate target. This will also apply if the soils is badly degraded, since soil restoration takes centuries or millennia. Rising carbon dioxide levels may also favor some species over others.
You could focus on finding out what the local native Pseudomonas bacteria host plants are, and that bacteria lives on the plant leaves, and create the rain clouds for a particular area. See the article at https://www.discovermagazine.com/planet-earth/does-rain-come-from-life-in-the-clouds -- Picture of the Pseudomonas creating a new rain cloud attached.
Whenever you are thinking about restoring forests, think from the ground up.
1.) Soil nutrients and organic matter...plant local native seeds in containers of the local soil, and see if the seedlings already have enough nutrients in that soil to survive past a few cm tall--or if you must add nutrients and organic matter to get them to survive?
2.) Start with the perennial grass and annual herb colonizer understory first... and make sure to add the local native legume family to add nitrogen naturally to the system. And if you can, add the nitrogen-fixing inoculant to the seeds when you plant them.
3.) If the area has been grazed in the past, usually you absolutely must add organic matter, nitrogen, phosphorus and calcium that was removed by the animals over time...and sequestered in their meat and bones. And if the animals were dairy goats or cows, then more will be needed, because of the amount of nutrients that were removed in their milk over time.
4.) Check the pH in the soil in an area where your forest trees grow already, and see if the desired reforest project area matches. If not, you need to add material to correct the difference in the pH.
5.) Check your existing forests for seedling reproduction.. by measuring the basal diameter at chest-height of 100 trees in a population. For example, across the whole State of California there are certain species of oaks that produce viable acorns, but for some reason or reasons in the soil, or the grazing destroyed the seedlings, or because of a non-native understory underneath the oaks--they have not been producing seedlings for many decades. So those species are now "Zombies" in that they are doomed to extinction, unless the cause of the non-reproduction can be cured. If your forest is already Zombized, and you do not find the cure for the Zombies, then all of your efforts could fail.